21106983 has 32 divisors (see below), whose sum is σ = 30643200. Its totient is φ = 12894336.

The previous prime is 21106961. The next prime is 21106993. The reversal of 21106983 is 38960112.

It is not a de Polignac number, because 21106983 - 2⁹ = 21106471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21106983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254260 + ... + 254342.

It is an arithmetic number, because the mean of its divisors is an integer number (957600).

Almost surely, 2^21106983 is an apocalyptic number.

21106983 is a deficient number, since it is larger than the sum of its proper divisors (9536217).

21106983 is a wasteful number, since it uses less digits than its factorization.

21106983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21106983 is about 4594.2336684152. The cubic root of 21106983 is about 276.3601290326.

The spelling of 21106983 in words is "twenty-one million, one hundred six thousand, nine hundred eighty-three".